<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>First Steps Into PHP</title>

</head>
<body>
    <form>
        N: <input type="text" name="num1" />
        M: <input type="text" name="num2" />
        <input type="submit" />
    </form>
	<ul>
        <?php
            if (isset($_GET['num1']) && isset($_GET['num2'])){
                $num1 = intval($_GET['num1']);
                $num2 = intval($_GET['num2']);
                for ($i = 1; $i<=$num1; $i++){ ?>
                    <li>List <?= $i ?></li>
                    <ul>
                    <?php
                    for ($k = 1; $k<=$num2; $k++){ ?>
                        <li>Element <?= $i.".".$k ?></li>
                    <?php }
                    ?></ul>
                <?php }
            }
        ?>
	</ul>
</body>
</html>